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Chicago -- The body of a poisoned Chicago lottery winner has been exhumed.

The Cook County Medical Examiner's Office wants to determine exactly how Urooj Khan died. Spokeswoman Mary Paleologos said Friday the autopsy will be performed immediately.

The body was taken away in a black hearse escorted by four police cars.

Examiners will take blood, tissue, bone, hair and nail samples. They'll also examine the lungs, liver, spleen and contents of the stomach and intestines. It will take two to three weeks to get test results.

Khan died in July as he was about to collect $425,000 in lottery winnings. His death initially was ruled a result of natural causes. But a relative asked for further tests, which revealed he was poisoned.